Chromium Alkoxycarbene Complexes Research Articles

New Method for the Preparation of Alkoxycarbene Complexes of Chromium, Molybdenum, and Tungsten Using Sulfonium Salts

Abstract Alkylation of tetramethylammonium acylate complexes of chromium, molybdenum, and tungsten with alkyldiphenylsulfonium salts readily proceeds under mild conditions to afford alkoxycarbene complexes containing a variety of functional groups in good yields.

Synthesis of .beta.-Lactones by the Photochemical Reactions of Chromium Alkoxycarbene Complexes with Aldehydes

Photolysis of chromium alkoxycarbene complexes with aldehydes in the presence of Lewis acids produced β-lactones in low yield. Incorporation of the aldehyde into either side chain of the carbene complex resulted in intramolecular processes which were considerably more efficient

Synthesis of optically active butenolides via chromium alkoxycarbene complexes: total synthesis of (+)-tetrahydrocerulenin and two butenolides from the marine sponge Plakortis lita

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of optically active butenolides via chromium alkoxycarbene complexes: total synthesis of (+)-tetrahydrocerulenin and two butenolides from the marine sponge Plakortis litaMichael Miller and Louis S. HegedusCite this: J. Org. Chem. 1993, 58, 24, 6779–6785Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November 1993https://doi.org/10.1021/jo00076a044RIGHTS & PERMISSIONSArticle Views589Altmetric-Citations38LEARN 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 (1020 KB) Get e-Alerts Get e-Alerts

Synthesis of azapenams, diazepinones, and dioxocyclams via the photolytic reaction of chromium alkoxycarbene complexes with imidazolines

Photolysis of chromium alkoxycarbene complexes with N-(benzyloxycarbonyl)imidazolines produced protected azapenams. Hydrogenolysis gave free azapenams which stable, one of which was characterized by X-ray crystallography. Hydrogenolysis under acidic conditions produced hexahydro-1,4-diazepin-5-ones. treatment of the free azapenams with camphorsulfonic acid produced unsaturated 14-membered tetraazamacrocycles in excellent yield. These were reduced to dioxocyclams

Photochemical reactions of chromium-alkoxycarbene complexes with stabilized ylides to produce push-pull captodative allenes

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical reactions of chromium-alkoxycarbene complexes with stabilized ylides to produce push-pull captodative allenesMichael R. Sestrick, Michael Miller, and Louis S. HegedusCite this: J. Am. Chem. Soc. 1992, 114, 11, 4079–4088Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published inissue 1 May 1992https://doi.org/10.1021/ja00037a008RIGHTS & PERMISSIONSArticle Views336Altmetric-Citations31LEARN 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 (1 MB) Get e-Alerts Get e-Alerts

Optically active quaternary carbon centers from the photoaddition of chromium-alkoxycarbene complexes and optically active thiazolines

The photolytic reaction of chromium-alkoxycarbene complexes with valine-derived, optically active thiazolines produced optically active β-lactam penam derivatives in fair to good yield and with high diastereoselectivity. In most cases alcoholosis of the β-lactam followed by solvolysis of the thiazolidine ring produced optically active quaternary centers having carbon substituents in four different oxidation states-alkane, alkoxy, aldehyde, and ester

Synthesis of optically active cyclobutanones by the photolysis of chromium-alkoxycarbene complexes in the presence of optically active ene carbamates

Optically active ene-carbamates derived from (S)-phenylglycine were allowed to photochemically react with a variety of (alkoxy)(alkyl)chromium-carbene complexes. Cyclobutanones were formed in fair to good yield with generally excellent control of stereochemistry

ChemInform Abstract: Synthesis of Cyclobutanones by the Photolytic Reaction of Chromium Carbene Complexes with Olefins: Inter‐ and Intramolecular Reactions.

AbstractPhotolytic reactions between a variety of chromium alkoxycarbene complexes such as (I) or (VII) and olefins such as (II) or cyclic conjugated dienes such as (V) in the presence of CO (III) give rise to cyclobutanones such as (IV), (VI), or (VIII) as strongly prevailing isomers.