Photochemical reactions of organosilicon compounds, particularly containing π-systems, have been described and discussed; 1. Silacyclohexadiene. 2. Disilacyclohexadiene. 3. Vinyldisilane. 4. Ethenylpolysilane and Silacyclopropene. 5. 1, 4-Disily-1, 4-dihydronaphthalene. 6. Epilog.
This review article deals with some latest aspects of organosilicon compounds which were used in selective organic synthesis. Application of the electrophilic substitution of organosilicon compounds such as alkenylsilane, alkynylsilane and allylsilane is described with some emphasis. Organic Synthesis using Diels-Alder cycloaddition of silicon enolates is also included. The role of the silicon-carbon bond in these highly selective reactions will be disclosed.
During the past several years since their discoveries, great progress has been made in chemistry, biology and clinical applications of vitamin D metabolites. Synthesis of these metabolites made it possible to confirm the assigned structures including stereochemical details and supply large quantities for biological tests and clinical applications. On the other hand, the general problem of structure-activity relationships in the vitamin D series has been approached by the synthesis of various structural analogs. This review presents the recent developments in the synthesis of active forms of vitamin D. (79 references)
This review, including two parts, deals with recent progress in the total synthesis of natural products. The first is concerned mainly with synthetic strategies for building up the frameworks of natural products. The second part places emphasis on the synthesis of macrolides, in which acyclic compounds with many asymmetric centers have been synthesized with elegant stereocontrol.
Recent many publications concerning the organic synthesis with carbon monixide (synthesis gas) are reviewed according to the following items. (1) Synthesis and utilization of methanol (methanol synthesis; conversion of methanol to gasoline; acetic acid production by methanol carbonylation; ethanol and ethylene from methanol). (2) Methanation (3) Fischer-Tropsch and related synthesis (Fischer-Tropsch synthesis; synthesis of C2-oxygenates; synthesis of higher alcohols; synthesis of paraffin waxes-polymethylene; isosynthesis process; aromatics production; hydrocarbons from carbon monoxide and steam; alkylamines synthesis; production of lower olefins-ethylene; production of glycols).