Trans coupling

One isomer that does not derive exclusively from 1,2-additions - the isomer 1,2,4,15 - is calculated to be more stable than all of the other mentioned isomers except the cis-Tisomer (Table 5.4) [33], Nevertheless, the three isomers, which are calculated as the most stable 1,2-addition-products, are the major isomers in the reductions with either borane or hydrazine (ds-l-isomer, see Sections 5.2.1 and 5.2.3) or with the Zn/Cu-couple trans-3 and e-isomer, see Section 5.2.2), whereas the 1,2-1,4-addition product (1,2,4,15-isomer) was not observed as a main product in a reduction. 

Although the fate of the zinc ligands was not unambiguously ascertained, it appeared clearly that palladium to zinc transmetallation occurred prior to cyclization. Indeed, palla-dium-ene reactions are known but generally require higher temperatures and, when run in association with a subsequent Stille cross-coupling, trans- 1,2-disubstituted cyclopentanes were generated (equation 81)115,116. 

Silylative Coupling (trans-Silylation) of Alkenes with Vinylsilanes. 207... 

Under the optimum conditions the reaction stereo- and regioselectively gives silylene-vinylene, siloxylene-vinylene [131], and silazanylene-vinylene [128, 129, 131] as well as silylene-vinylene-phenylene [132, 133] oligomers. This new, efficient route for preparation of organosilicon linear and cyclic oligomers as an extension of the silylative coupling trans silylation) of alkenes to dienes has recently been overviewed separately [131]. 

Kelly, C. Szalda, D. J. Creutz, C. Schwarz, H. A. Sutin, N. Electron transfer barriers for ground- and excited-state redox couples trans-dioxo(l,4,8,ll-tetramethyl-l,4,8,l 1- tetraazacyclo-tetradecane) osmium(VI)/osmium(V). Inorg. Chim. Acta 1996, 243, 39-45. 

A alk aromatic alkylation DC dehydrogenative coupling trans transalkylation isom isomerization HT hydrogen transfer ol oligomerization alk alkylation cycl cyclization. 

Bacteriophage RNA polymerases are available from a range of commercial suppliers, and transcription-only reactions should be performed according to the manufacturers instructions. The concentration of mRNA added to a subsequent translation reaction must be established empirically. Conditions for coupled tran-scription/translation are described in Section 15.6. 

The spectrum of the vinylic system of styrene consists of three sets—each a doublet of doublets representing a single proton. The X proton (56.80) is coupled trans across the double bond to the M proton (/XM = 18 Hz) and cis across the double bond to the A proton (Jxa = 11 Hz). The M proton (8 5.82) is coupled trans across the double bond to the X proton (/MX = 18 Hz)... 

Alkenyl-Aryl coupling. tran. -Alk enylalanes can be activated for coupling with aryl bromides or iodides with this nickel(0) complex to form arylated tran.r-alkenes in 65-957 yield (equation 1). Pd[P(C0H5)3]4 is a less effective catalyst. ... 

Agrawal, C.M., Micallef, D.M., Wirth, M.A., Lankford, J., Dearnaley, G. and McCabe, A.R. (1993) The effects of diamond-like-carbon coatings on the friction and wear of enhanced UHMWPE-metal couples. Trans 21st Annual Meet of the Society For Biomaterials, Birmingham, AL. 26, 10. 

Medina, S and Olver, A V, Regimes of Contact in Spline Couplings, Trans. Am. Soc. Mech Engrs., J. Tribology 124 (2002) 351-357. 

---