52937-36-7Relevant articles and documents
Unique variations of the distribution coefficients of homologues in the perfluorodecalin-acetonitrile heterophase system
Zenkevich,Kushakova
experimental part, p. 337 - 344 (2011/06/27)
The properties of the heterophase system perfluorodecalin-acetonitrile differ significantly from those of other combinations of the organic solvents limitedly soluble in each other. While for the most of such combinations the distribution coefficients (K d) of homologues increase in going from the simplest to next members of the series, in the case of perfluorodecalin- acetonitrile they remain almost constant. This provides a possibility to use the values of K d directly for the group identification of analytes, and first of all allows distinguishing isomeric alkenes and cycloalkanes, as well as the isomers of the hydrocarbons with greater formal unsaturation.
High yield of liquid range olefins obtained by converting i-propanol over zeolite H-ZSM-5
Mentzel, Uffe V.,Shunmugavel, Saravanamurugan,Hruby, Sarah L.,Christensen, Claus H.,Holm, Martin S.
experimental part, p. 17009 - 17013 (2010/03/23)
Methanol, ethanol, and i-propanol were converted under methanol-to-gasoline (MTH)-like conditions (400°C, 1-20 bar) over zeolite H-ZSM-5. For methanol and ethanol, the catalyst lifetimes and conversion capacities are comparable, but when i-propanol is use
ORGANOMETALLIC RUTHENIUM COMPLEXES AND RELATED METHODS FOR THE PREPARATION OF TETRA-SUBSTITUTED AND OTHER HINDERED OLEFINS
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Page/Page column 27, (2010/11/27)
The invention relates to ruthenium alkylidene complexes having an N-heterocyclic carbene ligand comprising a 5-membered heterocyclic ring having a carbenic carbon atom and at least one nitrogen atom contained within the 5-membered heterocyclic ring, wherein the nitrogen atom is directly attached to the carbenic carbon atom and is substituted by a phenyl ring, and wherein the phenyl ring has a hydrogen at either or both ortho positions and is substituted and at least one orthq or meta position. The invention also relates to an olefin metathesis reactions and particularly to the preparation of tetra-substituted cyclic olefins via a ring-closing metathesis.
Reactions of α-epoxysilanes with organocopper reagents. A stereoselective route to alkenes
Chauret, Denise C.,Chong, J. Michael
, p. 3695 - 3698 (2007/10/02)
Reactions of α-epoxysilanes with cuprate reagents can be controlled to give β-silyl alcohols as major products. An oxidation, Grignard addition, and elimination sequence then provides alkenes with up to 98% de.
TRANS ALKENES AND VINYLSILANES FROM TRANS-α-STANNYL EPOXIDES
Soderquist, John A.,Lopez, Carlos
, p. 6305 - 6306 (2007/10/02)
The reaction of trans-α-epoxystannanes (1) with an excess of alkyllithium reagents was found to undergo reductive alkylation cleanly to provide trans alkenes (3) whose isomeric purities equal or exceed those of 1.A mechanistic picture for this process which involves a carbenoid intermediate is presented.
Vinylic Organoboranes. 9. A General Stereospecific Synthesis of (Z)- and (E)-Disubstituted Alkenes via Organoboranes
Brown, Herbert C.,Basavaiah, Deevi,Kulkarni, Surendra U.,Bhat, Narayan G.,Prasad, J. V. N. Vara
, p. 239 - 246 (2007/10/02)
A general and stereospecific synthesis of (Z)-disubstituted alkenes using mono- and dihaloboranes is presented.The hydridation of dialkylhaloboranes in the presence of 1-alkynes provides the corresponding dialkylvinylboranes (1), representing the first general synthesis of such derivatives.Treatment with iodine in the presence of sodium methoxide induces the migration of one of the alkyl groups from boron to the adjacent carbon, followed by a rapid deiodoboronation to afford (Z)-disubstituted alkenes (2) in high yields.Similarly, the hydroboration of 1-alkynes with alkyl bromoboranes (R1BHBr*SMe2, 4) followed by iodination in the presence of sodium methoxide in methanol affords (Z)-disubstituted alkenes (2) in good yields.Both procedures constitute a general one-pot synthesis of (Z)- disubstituted alkenes from an alkene and 1-alkyne.A simple synthesis of Muscalure (7), the sex pheromone of the housefly (Musca domestica), is achieved in good yields.An alternative general stereospecific synthesis of (Z)- and (E)-disubstituted alkenes based on alkenylboronic esters is also described.
