Addition of CF3C02H to a CHzClz solution of N ( C H~C H , )~+ ( C O ) S W C H ( O C H~) C~H~-(5) at -78 OC produces a red solution of ( C O ) S W C H C~H~ (4), which was characterized by low-temperature ' H N M R and by reaction with P(n-Bu3) to give (C0)5WCH [ P (~-B U )~] C~H~ (6). Thermal decomposition of 4 at -56 OC occurs with a half-life of 24 min. The reaction of 4 with alkenes occurs rapidly at -78 " C to give phenylcyclopropanes; no metathesis-like products were observed. The relative reactivity of alkenes toward 4 was in theorder CH>=C(CH3)2 > CH2=CHCH3 >> CHz=CHl, indicating that the reaction involved electrophilic attack of the carbene complex on the alkene. The stereochemistry of cyclopropane formation could not be explained in terms of formation of the most stable intermediate metallacyclobutane. The stereochemistry of cyclopropane formation is explained in terms of transition state 25 which involved formation of a bond from the carbene carbon atom of 4 to the less substituted end of an alkene and interaction of the positively polarized, more substituted end of the alkene with the ipso carbon atom of the phenyl group of 4

Gold micropatterns have been generated by the laser photolysis of dimethylgold (III) acetylacetonate, Me2Au(acac), in the vapor phase. Linewidths as fine as 2 μm were readily obtained utilizing a simple optical projection system comprised of a 4× projection lens, a lithographic photomask, and the UV output from an excimer laser. The single-step, dry process for selectively producing metal patterns is highlighted.

The first laser-induced deposition of copper has been demonstrated using a volatile copper coordination complex. The technique is characterized by reasonable rates and by the high quality of copper produced.

High quality gold spots and lines have been deposited from gaseous dimethyl (2, 4-pentanedionato) gold (III) using a focused argon ion laser. Growth rates of 1 μm/s at power densities of 4×105 W/cm2 were obtained. Resistivity, threshold writing power densities, and deposition rates were measured and their relationship to the physical and chemical properties of the gaseous complex are explored.

The photochemical generation and deposition of copper metal from a volatile copper coordination complex are described. Pulsed and cw ultraviolet light sources were used to induce deposition. The chemical compositions of the films are compared for all methods.