Addition of Unsaturated Compounds

The addition of gem-disubstituted olefins, CH2=CXY, on polysilane 2 also worked well [23,24], For example, the addition of 2-methoxypropene and methylenecyclohexane afforded the expected adducts with 73% and 77% degrees of substitution, although a higher loss of molecular weight with respect to the hydrosilylation of monosubstituted olefins is observed. Copolymer 21, containing both mono- and disubstituted olefins, was made from 2 in a single reaction by adding 50 mol% vinyl acetic acid and an excess of 2-methoxypro-pene to the THF-polymer solution [24], 

Analogously to terminal alkenes, the reaction of 2 with valeraldehyde and cyclohexanone under radical-based conditions allowed for the preparation of the corresponding functional polysilanes 22 (Reaction 8.12). The efficiency of Si—H bond replacement was 80-85% [21]. 

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Beltrame, P. Addition of unsaturated compounds to each other, Compr. Chem. Kinet. 1973, 9, 87-162. 

Several additions of unsaturated compounds to molecules with a resonant dipole, leading to five-membered rings according to... 

ADDITION OF UNSATURATED COMPOUNDS TO EACH OTHER 5.4 ACTIVATION PARAMETERS... 

Volume 9 deals with the majority of addition and elimination reactions involving aliphatic compounds. Chapter 1 covers electrophilic addition processes, mainly of water, acids and halogens to olefins and acetylenes, and Chapter 2 the addition of unsaturated compounds to each other (the Diels-Alder reaction and other cycloadditions). This is followed by a full discussion of a-, y- and S-eliminations (mainly olefin and alkyne forming) and fragmentation reactions. In Chapter 4 carbene and carbenoid reactions, and in Chapter 5 alkene isomerisation (including prototropic and anionotropic, and Cope and Claisen rearrangements), are discussed. 

Inhibition of the L-enzyme (which leads to the increased formation of o-p-hydroxyesters) was accomplished by addition of unsaturated compounds such as allyl alcohol [888] or methyl vinyl ketone (Table 2.4, Scheme 2.123) [889]. The... 

Similar conclusions were reached in a second paper dealing with the pulse-radiolytic reduction of Cd + alone. Further reactions of these ions are the subject of another paper and, besides electron-transfer processes, additions of unsaturated compounds and oxygen atom transfers from NgO are described. The products of these latter reactions, MO+, behave like OH in their reactions with halide ions. In the electron-transfer processes, the reactions with peroxodisulphate proceed by a second-order pathway with rate constants of ca. 10 1 mol s ... 

Addition to Multiple Bonds. Although the additions of unsaturated compounds to bicyclo [2,1,0] pentane have been generally regarded as stepwise, an... 

These are Diels-Alder reactions, viz., reactions of addition of unsaturated compounds to dienes. The simplest reaction is the addition of ethylene to butadiene... 

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