Studies on ylides: Carbonyl olefination with (p-nitro benzylidene)triphenylarsenane
作者:P.S. Kendurkar、R.S. Tewari
DOI:10.1016/s0022-328x(00)80646-4
日期:1973.11
(p-Nitrobenzylidene)triphenylarsenane, a semistabilized arsonium ylide has been prepared and reacted with carbonyl compounds to yield olefins as opposed to epoxidation products. Treatment of the ylide with a ranged acyl halides gave new disubstituted arsonium ylides. IR and NMR spectral data for the resulting products are reported.
β-Elimination of the isonitrile group in alkylation reactions of C–H acids activated by the isonitrile function
作者:Mikołaj Jawdosiuk、Maciej Umiński
DOI:10.1039/c39820000979
日期:——
During phase-transfer alkylation of the isonitriles R1R2CHNC with X–CH2–Y, where X is a leaving group and Y an electron withdrawing group, some of the alkylation products undergo β-elimination of the isonitrilefunction to yield R1R2CCHY.
在异氰酸酯R 1 R 2 CHNC用X–CH 2 –Y进行相转移烷基化的过程中,其中X是一个离去基团,Y是一个吸电子基团,一些烷基化产物会经历β-消除的异腈官能团,从而生成R 1 R 2 C CHY。
Synthesis of Fluorenes<i>via</i>the Palladium-Catalyzed 5-<i>exo-dig</i>Annulation of<i>o</i>-Alkynylbiaryls
作者:Natalia Chernyak、Vladimir Gevorgyan
DOI:10.1002/adsc.200800765
日期:2009.5
The direct Pd-catalyzed intramolecular rapidly with electron-deficient benzene ring, which, in hydroarylation of o-alkynyl biaryls proceeded in highly combination with a substantial isotope effect observed, stereoselective manner producing fluorenes 2, the products of 5-exo-dig cyclization, in excellent yields. The cascade intermolecular arylation, incorporated in this transformation, allowed for efficient
Preparation and properties of some thiouronium fluorenylides and cyclopentadienylides and the attempted preparation of selenouronium and guanidinium fluorenylides
作者:D. Lloyd、R.W. Millar、H. lumbroso、C. liégeois
DOI:10.1016/0040-4020(77)84089-1
日期:1977.1
cyelopentadienylides, prepared by treatment of the corresponding thiouronium salts with non-aqueous base, exist as tautomeric mixtures of the fluorenylide and fluorenylisothiourea, but undergo reactions typical of ylides, e.g. Wittig reactions with aldehydes or nitrosobenzene; a 2,3,4-triphenylcyclopentadienylide gave anomalous products. The ylides also react with acids, alkali, benzyl bromide, and dimethylacetylene
A Simple Synthesis of (Nitroaryl)ethylene Derivatives<i>via</i>the Vicarious Nucleophilic Substitution of Hydrogen
作者:M. Makosza、A. Tyrała
DOI:10.1055/s-1987-28280
日期:——
An efficient method for the synthesis of (nitroaryl)ethylene derivatives containing an electron-withdrawing substituent on the double bond has been developed starting from readily available nitrobenzylsulfonyl compounds via vicarious nucleophilic substitution.