Cycloaddition Of Dichloroketene Research Articles

Synthesis of 1,6-Dioxadispiro[2.0.4.4]dodecan-7-one

Abstract 1,6-Dioxadispiro[2.0.4.4]dodecan-7-one, a useful intermediate of dispiro-α-methylene-γ-butyrolactones, was synthesized in a good overall yield by the cycloaddition of dichloroketene to 1,2-dimethylenecyclohexane, and the zinc dust reduction of the chlorine atoms, followed by the Baeyer-Villiger oxidation with m-chloroperbenzoic acid.

Reaction of sulfene and dichloroketene with open‐chain N,N‐disubstituted α‐aminomethyleneketones. Synthesis of 4‐dialkylamino‐3,4‐dihydro‐5,6‐dimethyl‐1,2‐oxathiin 2,2‐dioxides and of 6,(5)(di)alkyl‐3‐chloro‐4‐methylphenylamino‐2H‐pyran‐2‐ones

AbstractCycloaddition of sulfene to N,N‐disubstituted 4‐amino‐3‐methyl‐3‐buten‐2‐ones (III) occurred in fair to good yield only in the case of aliphatic N‐substitution to give 4‐dialkylamino‐3,4‐dihydro‐5,6‐dimethyl‐1,2‐oxathiin 2,2‐dioxides, whereas N,N‐disubstituted 1‐amino‐1‐penten‐3‐ones (II) did not react at all. Cycloaddition of dichloroketene to II, III and N,N‐disubstituted 4‐amino‐3‐buten‐2‐ones occurred only in the case of the methylphenylamino derivative, giving in good to moderate yield 6,(5)(di)alkyl‐3,3‐dichloro‐3,4‐dihydro‐4‐methylphenylamino‐2‐Hpyran‐2‐ones, which were dehydrochlorinated with DBN to 6,(5)(di)alkyl‐3‐chloro‐4‐methylphenylamino‐2H‐pyran‐2‐ones.

Synthesis of hydroxyl‐containing polyamides by ring‐opening polyaddition of 3,3′‐disubstituted bis‐β‐propiolactone with diamines

AbstractA new bis‐β‐lactone monomer, 3,3′‐p‐phenylenebis(2,2‐dichloro‐β‐propiolactone), was synthesized by the cycloaddition of dichloroketene with terephthalaldehyde. Hydroxyl‐containing polyamides with inherent viscosities as high as 1.1 were prepared by the ring‐opening polyaddition of the bis‐β‐lactone with various diamines in tetrahydrofuran at room temperature. They were readily soluble in a wide range of solvents, which included tetrahydrofuran and acetone. The polymers melted and decomposed at temperatures around 200°C.

Halogenated ketenes. 32. The cycloaddition of dichloroketene with silyl enol ethers

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalogenated ketenes. 32. The cycloaddition of dichloroketene with silyl enol ethersWilliam T. Brady and R. Michael LloydCite this: J. Org. Chem. 1979, 44, 14, 2560–2564Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://doi.org/10.1021/jo01328a048RIGHTS & PERMISSIONSArticle Views444Altmetric-Citations18LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (652 KB) Get e-Alerts Get e-Alerts

Cycloadditions. 26. Regio- and stereochemistry of the cycloadditions of dichloroketene to 2-methyl- and 3-methyl-2-cholestene

Cycloadditions. 26. Regio- and stereochemistry of the cycloadditions of dichloroketene to 2-methyl- and 3-methyl-2-cholestene

Halogenated ketenes. 31. Cycloaddition of dichloroketene with hindered olefins

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalogenated ketenes. 31. Cycloaddition of dichloroketene with hindered olefinsDavid A. Bak and William T. BradyCite this: J. Org. Chem. 1979, 44, 1, 107–110Publication Date (Print):January 1, 1979Publication History Published online1 May 2002Published inissue 1 January 1979https://doi.org/10.1021/jo01315a024RIGHTS & PERMISSIONSArticle Views1158Altmetric-Citations62LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (499 KB) Get e-Alerts Get e-Alerts

Tropolone Analogues of the Amino Acid Mimosine

The synthesis of DL-α-amino-β-(4-hydroxy-5-oxocyclohepta-1,3,6-trienyl)propanoic acid (2) and the corresponding 6-hydroxy isomer (3), tropolone analogues of the wool-growth inhibiting amino acid mimosine (1),is described. Both isomers were obtained in a single sequence, commencing with the cycloaddition of dichloroketene to (β, β-diethoxyethyl)cyclopentadiene, and were readily separated at an intermediate stage via the copper complexes.

Substituent effects on the preparations and thermal decarboxylations of .beta.-lactones derived from the cycloaddition of dichloroketene with monosubstituted benzaldehydes

Substituent effects on the preparations and thermal decarboxylations of .beta.-lactones derived from the cycloaddition of dichloroketene with monosubstituted benzaldehydes

The stereochemistry of dichloroketene and chlorosulfonyl isocyanate cyclo-addition to 4-t-butylmethylenecyclohexane

The stereochemistry of the cycloaddition of dichloroketene (1) and chlorosulfonyl isocyanate (2) to 4-t-butylmethylenecyclohexane (4) has been investigated as a model for the 2πs + 2πa cycloaddition to the methylenecyclohexane system. The reactions are kinetically controlled and proceed mainly by axial attack to yield the thermodynamically less stable isomers 7 and 10, as major products, respectively.

Halogenated ketenes. XXIII. 2‐Oxetanones

AbstractThe cycloaddition of dichloroketene with several simple ketones to produce 2‐oxetanones is described. The ketene is generated in situ by the zine dehalogenation method and the zinc/zinc chloride activates the carbonyl group of the ketone. The cycloaddition of methylchloro‐ and methylbromoketenes with some activated carbonyl compounds is also deseribed.

Cycloadditions. V. Stereoelectronic effects in the cycloaddition of dichloroketene to cyclohexenes

Cycloadditions. V. Stereoelectronic effects in the cycloaddition of dichloroketene to cyclohexenes