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1,2-Versus 1,4-reduction of α,β-unsaturated carbonyl compounds in the gas phase

✍ Scribed by Yeunghaw Ho; Robert R. Squires

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
785 KB
Volume
28
Category
Article
ISSN
1076-5174

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✦ Synopsis

The regioselectivity involved in the gas-phase hydride reduction of a,bunsaturated carbonyl compounds by pentacoordinate silicon hydride ions is investigated. The kinetics and product distributions of the reactions of acrolein, methyl vinyl ketone and cyclohex-tenone with monoalkoxysiliconate ions of the general composition RSiH,(OR')-were examined with the flowing afterglow-triple quadrupole technique. All three substrates react by hydride transfer and by formation of a siliconate adduct in which hydride reduction of the organic reactant has occurred. The structures of these adducts and the hydride transfer products were identified by various tandem mass spectrometric protocols, including analysis of competitive collision-induced dissociation (CID) reactions and comparisons of CID spectra obtained from reference ions with known structures. 1,QReduction forming an enolate ion product is found to be the dominant or exclusive process with all three substrates, i.e. acrolein (70 f 5%), methyl vinyl ketone (72 f 5%) and cyclohex-Zenone (100%). Comparisons are made between these gas-phase results and the regioselectivity reported for analogous condensed-phase reactions. The observed behavior is discussed in terms of the reaction thermochemistry.

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