Meijer

Meijer E J, Frenkel D, LeSar R A and Ladd A J C 1990 Location of melting point at 300 K of nitrogen by Monte Carlo simulation J. Chem. Phys. 92 7570-5... 

Meijer G and Bethune D S 1990 Laser deposition of oarbon olusters on surfaoes-a new approaoh to the study of fullerenes J. Chem. Rhys. 93 7800-2... 

Meijer G and Bethune D S 1990 Mass speotrosoopio oonfirmation of the presenoe of Cgg in laboratory-produoed oarbon dust Chem. Phys. Lett. 175 1-2... 

Meijer and L. Brandsma, Reel. Trav. Chim. de Graaf and H. Schreurs, Reel. Trav. Chim. 

The majority of preparative methods which have been used for obtaining cyclopropane derivatives involve carbene addition to an olefmic bond, if acetylenes are used in the reaction, cyclopropenes are obtained. Heteroatom-substituted or vinyl cydopropanes come from alkenyl bromides or enol acetates (A. de Meijere, 1979 E. J. Corey, 1975 B E. Wenkert, 1970 A). The carbenes needed for cyclopropane syntheses can be obtained in situ by a-elimination of hydrogen halides with strong bases (R. Kdstcr, 1971 E.J. Corey, 1975 B), by copper catalyzed decomposition of diazo compounds (E. Wenkert, 1970 A S.D. Burke, 1979 N.J. Turro, 1966), or by reductive elimination of iodine from gem-diiodides (J. Nishimura, 1969 D. Wen-disch, 1971 J.M. Denis, 1972 H.E. Simmons, 1973 C. Girard, 1974),... 

The growing importance of cyclopropane derivatives (A. de Meijere, 1979), as synthetic intermediates originates in the unique, olefin-like properties of this carbocycle. Cyclopropane derivatives with one or two activating groups are easily opened (see. p. 69f.). Some of these reactions are highly regio- and stereoselective (E. Wenkert, 1970 A, B E. J. Corey, 1956 A, B, 1975 see p. 70). Many appropriately substituted cyclopropane derivatives yield 1,4-difunctional compounds under mild nucleophilic or reductive reaction conditions. Such compounds are especially useful in syntheses of cyclopentenone derivatives and of heterocycles (see also sections 1.13.3 and 4.6.4). 

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