Stereochemistry and mechanism of the Wittig reaction. Diasteromeric reaction intermediates and analysis of the reaction course
作者:Bruce E. Maryanoff、Allen B. Reitz、Martin S. Mutter、Robert R. Whittle、R. A. Olofson
DOI:10.1021/ja00284a034
日期:1986.11
respectively). The above-mentioned rate studies, entailing low-temperature ' 8 , I3C, and/or "P NMR spectroscopic measurements, indicate that the equilibration of cisto truns-oxaphosphetane arises from a larger rate of reversion of the cis-oxaphosphetane to ylide and aldehyde. Crossover experiments involving deprotonation of diastereomerically pure P-hydroxyphosphonium salts 7a and Sa (R = Ph), followed by the
A process for preparing monoesters comprises the step of reacting at least one diol with at least one carboxylic acid in a biphasic solvent system, the carboxylic acid being sufficiently water soluble to allow esterification to occur, and the biphasic solvent system comprising water and at least one aprotic solvent in which the resulting monoester has greater solubility than in water.
A [Cp3 Ba]∞ coordination polymer with a chain structure is present in the compound [Cp3 Ba]- [Bu4 P]+ . The barium center is tetrahedrally coordinated by four η5 -Cp rings (a section of the chain is shown on the right). The Bu4 P cations bridge neighboring [Cp3 Ba]∞ chains through short hydrogen bonds, and the cocrystallized THF molecules do not coordinate to the barium centers but are instead involved
Process for preparing functional group-containing olefinic compounds
申请人:3M Innovative Properties Company
公开号:EP2314559A2
公开(公告)日:2011-04-27
A process for preparing functional group-containing olefinic compounds comprising the steps of (a) reacting (1) at least one functional group-containing nucleophile with (2) at least one carbonyl-containing compound that comprises at least one group that is a leaving group, or that is capable of subsequent conversion to a leaving group, and that optionally comprises one or more isolated carbon to carbon double or triple bonds, to form the corresponding functional group-containing carbonyl-containing compound, said carbonyl-containing compound being selected from the group consisting of ketones and aldehydes; and (b) reacting said functional group-containing carbonyl-containing compound with at least one alkylidene phosphorane comprising an alkylidene moiety and three other moieties bonded to its phosphorus atom, said alkylidene moiety optionally comprising one or more carbon to carbon double or triple bonds, to form a functional group-containing olefinic compound.