... syn and anti addition products indicating a carbocation intermediate.51 Nucleophilic solvents compete with bromide, but anti stereoselectivity is still observed, except when ERG substituents are present. It is proposed that anti ...

... syn and anti addition to alkenes The two possible modes of addition of a reagent X—Y to an alkene are shown in (a). In syn addition, both groups add to the same side or face of the molecule. In anti addition, the groups add to the ...

... syn and anti addition products . If the principal intermediate were an ion pair that collapsed faster than rotation about the C - C bond , syn addition could predominate . Br - Br Br Br Br Br Whether a bridged intermediate or a ...

... syn and anti addition occur when carbocations are intermediates. H C X(OH) H CC H X C C C and Syn and anti addition occur in hydrohalogenation and hydration. or H 2 O, H+ X(OH) •. Addition. Reactions. of. Alkenes. [1] Hydrohalogenation ...

... syn and anti addition products is formed . The termolecular mechanism is expected to give anti addition . Attack by the nucleophile occurs at the opposite side of the double bond from proton addition . H CI Nu : Section 6.1 of Part A ...

... syn and anti addition of AIH3 to 2 show a greater degree of carbonyl bending than is found for adamantanone. The degree of hyperconjugation is controlled by orbital overlap and electron availability. The HNu—CC:O—C,,—C/; dihedral angles ...

... syn and anti addition to an alkene. D E B A XY anti addition X E B Y D A may produce stereoisomeric products.5 The term anti means that one group adds from the top of the molecule (as defined by the plane of the substituents on a double ...

... syn and anti addition products obtained from the addition of hypobromous acid to the two diastereomers of 1 - phenylprop - 1 - ene in different solvents In dioxane ( 5.4 ) In propanone % syn % anti % syn % anti E - 1 - phenylprop - 1 ...

... syn- and anti-addition mechanisms have been proposed. The former appears to predominate for bicyclic systems such as norbornene; a mechanism involving a four-centre transition state, but no intermediate, has been proposed. In more polar ...

... syn and anti addition is observed. Ph X Y - X + Ph X + H H H Ph H CH3 H CH3 H CH3 CH3 anti addition predominates Y - Y Ph H H X-Y Ph H X anti addition H X Y Ph + CH3 Y - H + H and CH3 Y X Ph H syn addition H CH3 9.13. Rolston, J. H. ...