Silicon-nitrogen Bond Research Articles

Highly reliable ECR N2O-plasma polyoxide grown on heavily phosphorus-doped polysilicon films

Reliability of polyoxide grown by electron cyclotron resonance (ECR) N2O-plasma on heavily phosphorus-doped polysilicon has been investigated for the interpoly dielectrics (IPDs) of nonvolatile memories (NVMs). ECR N2O-plasma polyoxide grown on polysilicon with phosphorus of 1 × 1021 cm−3 exhibits a significantly high breakdown field of 10 MV/cm and low electron trapping rate of 0.5 V, which are regardless of phosphorus concentration. The improvements are attributed to the smooth polyoxide/polysilicon interface, low phosphorus concentration, and nitrogen-rich layer with strong silicon-nitrogen bonds at the polyoxide/polysilicon interface.

ChemInform Abstract: Silicon‐Nitrogen Bond Formation by Nucleophilic Activation of Silicon‐ Hydrogen Bonds.

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Siliconnitrogen bond formation by nucleophilic activation of siliconhydrogen bonds

A method of forming SiN bonds by dehydro-coupling of SiH and NH bonds in the presence of a nucleophilic catalyst is reported. The method is useful for the preparation of silylamines and silazanes and for crosslinking of organometallics polymers.

Silylation of resist materials using di- and polyfunctional organosilicon compounds

Abstract Different types of polyfunctional organosilicon compounds (chloro-, alkoxy-, acetoxysilanes, linear and cyclic silazanes and silylamines) were studied as silylating agents in the diffusion limited heterogeneous silylation process. It was shown that compounds with reactive silicon nitrogen bonds were most effective at silylating AZ4110 resist. Surprisingly, it was found that the higher the organosilicon compound reactivity, the lower the degree of silylation of the photoresist. One of the most effective silylating agents was found to be bis (dimethylamino)dimethylsilane (BDAMS). The chemistry of silylation of both novolak resins and 1,2,5-naphthoquinone diazo type photoactive compounds (PAC) leading to the formation of crosslinked materials is discussed. The formation of triazine derivatives was also detected. Photoresist images which were UV irradiated at 365 nm after exposure and development were found to be more amenable to silylation than those which had not.

Simple functional siloles. 3,4-Dimethylsiloles with silicon-fluorine, silicon-oxygen, or silicon-nitrogen bonds and other silicon-substituted derivatives

Simple functional siloles. 3,4-Dimethylsiloles with silicon-fluorine, silicon-oxygen, or silicon-nitrogen bonds and other silicon-substituted derivatives

Etude structurale par RMN 29Si—V. Dérivés de la quinoléine et de l'isoquinoléine

A series of silylated compounds obtained from quinoline or isoquinoline were studied by 29Si NMR using the selective polarization transfer (SPT). Both silicon chemical shifts and 29Si, 1H coupling constants have been measured. These results are the first example of coupling through siliconnitrogen bonds.

Cleavage of silicon-nitrogen bonds by acid chlorides: an unusual synthetic route to amides

Par reaction de dichlorures de diacides carboxyliques avec des silazanes obtention de chlorures d'amidoyle et de diamides, avec des disilazanes, formation d'imides et de polyimides

Homogeneous catalytic formation of carbon-nitrogen bonds. 2. Catalytic activation of the silicon-nitrogen bond

Homogeneous catalytic formation of carbon-nitrogen bonds. 2. Catalytic activation of the silicon-nitrogen bond

Activation of silicon-hydrogen, silicon-oxygen, silicon-nitrogen bonds in heterogeneous phase : Some new methods in organic synthesis

Anionic activation of Si-H, Si-O and Si-N bonds by fluoride ions under heterogeneous conditions is reported: Si-H activated by KF or CsF is a very powerful and selective reducing reagent; the carbonyl group of aldehydes, ketones or esters can be reduced without reduction of other functional groups (C&z.dbnd;C, NO 2, Br, amido). Furthermore, selective reductions of aldehydes in the presence of ketones and ketones in the presence of carboxylic esters are also possible. CsF in the presence of Si(OR) 4 is found to be very efficient in promoting Michael additions of monoketones and arylacetonitriles on different kinds of Michael acceptors such as ⇌, β unsaturated ketones, esters, nitriles and even amides. This constitutes an extension of Michael reaction since the addition occurs even with crowded ketones. N, N bis(silyl)enamines activated by fluoride ions react with carbonyl compounds and provide an interesting route to 2-aza-1, 3 dienes.

N,N-bis(silyl)enamines as protected primary vinylamines. Nucleophilic activation of the siliconnitrogen bond.

N,N-bis(silyl)enamines react with electrohiles in the presence of catalytic amounts of nucleophile. The reaction of carbonyl compounds catalyzed by fluoride ion provides an interesting route to 2−aza−1,3−dienes. The methoxide ion catalyzed reaction of N,N—dimethyl- formade gives rise to enamidines.

Semiempirical calculation of diamagnetic susceptibilities of organosilicon compounds containing Si–X (X = O, S, and N) bonds

A semiempirical model is reported to calculate diamagnetic susceptibilities of organosilicon compounds containing silicon–oxygen, silicon–sulfur and silicon–nitrogen bonds. The diamagmetic susceptibilities are considered to be contributed by the atoms, bonds, and bond–bond interactions. Diamagnetic susceptibilities are expressed in terms of parameters and have been calculated for title compounds. Semiemperical values agree with experimental values within 0.75%.

Syntheses de dimethyl-1,2 silacycloalcanes a isomere geometrique preferentiel. Cas des derives fonctionnels a liaison SiN, SiO ou SiF

Syntheses of functional geometric stereo-models containing silacyclopentane or silacyclobutane groups with siliconnitrogen, siliconoxygen or silicon fluorine bonds are reported. Using the exchange reaction between hydrogeno- or fluoro-silanes and alcoxy- (or amino-)tin compounds, it is possible to obtain, for the first time, the Z isomer of 1-alkoxy- (or amino-)-1,2-dimethylsilacycloalkanes. The amino derivatives of aminolithium (R 2NLi) and hydrogenosilanes are also prepared.

Unsaturated bridgehead silicon intermediates. Dipolar character of unsaturated siliconnitrogen bonds in such intermediates

Photolysis of 1-azido-1-silabicyclo[2.2.1]heptane and 1-azido-1-silabicyclo[2.2.2.]octane give loss of nitrogen and rearrangement with ring enlargement yielding silaimine reaction intermediates which were trapped by reaction with methyltrimethoxysilane and triethoxysilane. Evidence is presented which indicates that the unsaturated siliconnitrogen bonds in the intermediates have considerable polar character and do not behave like triplet diradicals. The balance of the evidence favors, but does not completely prove, that the intermediates have significant π-bonding.

ChemInform Abstract: SILICON‐NITROGEN BOND. XXXVII. SYNTHESIS AND REACTIONS OF 1,2‐BIS(TRIMETHYLSILYL)IMINES. 2

Chemischer InformationsdienstVolume 10, Issue 20 Organoelement Compounds ChemInform Abstract: SILICON-NITROGEN BOND. XXXVII. SYNTHESIS AND REACTIONS OF 1,2-BIS(TRIMETHYLSILYL)IMINES. 2 H. BUCHWALD, H. BUCHWALDSearch for more papers by this authorK. RUEHLMANN, K. RUEHLMANNSearch for more papers by this author H. BUCHWALD, H. BUCHWALDSearch for more papers by this authorK. RUEHLMANN, K. RUEHLMANNSearch for more papers by this author First published: May 15, 1979 https://doi.org/10.1002/chin.197920256Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume10, Issue20May 15, 1979 RelatedInformation

Aminosilylation of dimethyl acetylenedicarboxylate

Nucleophilic addition of N-trimethylsilylakylamines, Me 3SiNHR (where R = and t-Bu), and bis(trimethylsilyl)amine to dimethyl acetylenedicarboxylate occurs via siliconnitrogen bond cleavage to give dimethyl 2-alkyl-(or trimethylsilyl-)amino-3-trimethylsilyl furmarates as the sole products. These are cleaved by methanol to yield dimethyl 2-(alkyl)aminofumarates. Tris(trimethylsilyl)amine does not react with dimethyl acetylenedicarboxylate.

PREPARATION AND NMR STUDY OF PHOSPHORUS-FLUORINE COMPOUNDS UNDERGOING INTRAMOLECULAR EXCHANGE. PART 1.1BENZYLMETHYLAMINOFLUORO-PHOSPHORANES

Abstract The preparation is described of a series of benzylmethylamino-substituted fluorophosphoranes of general formula PhCH2(Me)NPF4–n R n (where R = Me, Ph; n = 0, 1, 2) from the cleavage of the silicon-nitrogen bond in benzylmethylamino-trimethylsilane by fluorophosphoranes. The structures of the new compounds are deduced from 1H, 19F and 31P nmr data. Variable temperature spectra give information about intramolecular exchange processes, and a detailed study was made of benzylmethylamino-diphenyldifluorophosphorane and of the corresponding 2-methyl-piperidyl compound.

Formation of heterocyclic compounds by use of N′-diphenylmethylene-N-phenyl-N-trimethylsilylurea

The reactions of N′-diphenylmethylene-N-phenyl-N-trimethylsilylurea (I) with variety of acceptor molecules have been studied. Imidazolidinone, triazinone, and pyrimidinone derivatives were obtained via[4 + 1] or [4 + 2] cyclizations with cyclohexyl isocyanide, methyl isocyanate, dimethyl acetylenedicarboxylate, and trichloroacetonitrile, followed by desilylation with methanol. Dimethylcyanamide reacts with the urea (I) to give 3-diphenyl-methylene-1,1-dimethyl-2-phenylguanidine (VIII)via the thermal decomposition of the intermediate 1,4-dihydro-2-dimethylamino-6-trimethylsilyloxy-1,4,4-triphenyl-1,3,5-triazine. Linear products of insertion into a silicon–nitrogen bond of the urea (I) are obtained, possibly via a common intermediate, in the reactions with diphenylketen and with chloral. 2,3-Dihydro-6-methyl-2,2-diphenyl-3-phenylcarbamoyl-1,3-oxazin-4-one is formed from diketen (4-methyleneoxetan-2-one).

Reaction of Xenon Difluoride. Part II. Oxidative-fluorination of Phosphorus and Iodine Compounds and Cleavage of Silicon–Sulfur and Silicon–Nitrogen Bonds

Reaction of alkyl(aryl)phosphines with xenon difluoride gives alkyl(aryl)hydridofluorophosphoranes which were characterized by proton and fluorine n.m.r. spectroscopy. With phenylchlorophosphines, substitution of chlorine by fluorine accompanied oxidative-fluorination to give phenylfluorophosphoranes, (C6H5)nPF5−n. With tert-butylchlorophosphines, chlorination of the tert-butyl group accompanied oxidative-fluorination, and a mixture of products was obtained. Reaction of xenon difluoride with methyl iodide gives methyliodine(III) difluoride, characterized by proton and fluorine n.m.r. spectroscopy.Silicon–sulfur and silicon-nitrogen bonds are cleaved by xenon difluoride and an intermediate containing a xenon–nitrogen bond is postulated.Reaction of xenon difluoride with hexafluoroacetone, perfluoropinacol, or disodium perfluoropinacolate failed to give stable xenon esters.

ChemInform Abstract: CRYSTAL AND MOLECULAR STRUCTURE OF (IMINOBIS(ETHYLENEOXY))DIPHENYLSILANE, A FIVE‐CO‐ORDINATE SILICON COMPOUND

Chemischer InformationsdienstVolume 5, Issue 51 Organoelement Compounds ChemInform Abstract: CRYSTAL AND MOLECULAR STRUCTURE OF (IMINOBIS(ETHYLENEOXY))DIPHENYLSILANE, A FIVE-CO-ORDINATE SILICON COMPOUND JOHN J. DALY, JOHN J. DALYSearch for more papers by this authorFRANCISCO SANZ, FRANCISCO SANZSearch for more papers by this author JOHN J. DALY, JOHN J. DALYSearch for more papers by this authorFRANCISCO SANZ, FRANCISCO SANZSearch for more papers by this author First published: December 24, 1974 https://doi.org/10.1002/chin.197451374AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat No abstract is available for this article. Volume5, Issue51December 24, 1974 RelatedInformation

Hammet correlations for the solvolysis of silylpyrroles

The siliconnitrogen bond in (XC 6H 4)Me 2SiNC 4H 4 (X = p-MeO, p-Me, m-Me, H, p-Cl) is cleaved in absolute ethanol containing sulphuric acid or amine buffers. The logarithms of the rate constants correlate with σ o-constants, the p-values being -0.97 for the acid-catalysed reaction, and +1.8 and +2.6 for the reactions catalysed by amine and ethoxide anion, respectively. Mechanisms involving pentacoordinate silicon are suggested.