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The cheletropic reaction of dichlorophosphines to tricyclo[5.3.1.04,9]undeca-2,5-diene, followed by hydrolysis with water gave 6-substituted-6-oxo-6-phosphapentacyclo[6.3.1.02,4.03,7.05,10]dodecanes whose structures were established by an X-ray crystallography.

A new series of lariat ethers have been prepared by a high pressure SNAr reaction, in which various heteroaromatics are directly connected to the nitrogens of 12-, 15- and 18-membered aza-crown ethers. Liquid membrane transport studies demonstrated that lariat ethers having thiazole, oxazole, pyrazine and pyridazine rings on their sidearms exhibited excellent Ag+ ion selectivity. 13C NMR binding experiments revealed that these lariat ethers selectively formed encapsulated Ag+ complexes in a different fashion from that of double armed crown ethers. Cooperative action between the heteroaromatic sidearm and the aza-crown ring afforded unique cation recognition.

Reactions of indolizine-3-carbonitriles with dimethyl acetylenedicarboxylate (DMAD), in the presence of Pd–C, gave the corresponding [2.2.3]cyclazines in low to moderate yields, whereas, in the absence of Pd–C, the same reactions afforded the 1 : 2 molar products. The X-ray analysis of one of the 1 : 2 adducts established that the structure was dimethyl 2-cyano-3-styrylpyrrole-1,4-dicarboxylate. A possible mechanism is presented.

Cycloaddition reactions of 6-cyanobenz[a]indolizines with activated alkynes such as dimethyl acetylenedicarboxylate, diacetylacetylene, methyl propiolate, methyl trimethylsilylpropiolate, methyl phenylpropiolate, and 4-phenyl-3-butyn-2-one were investigated.

Title compounds were prepared through high pressure S N Ar reactions (0.8 GPa, 100 ° C) of homopiperazine with five- and six-membered heteroatomic halides, the yields being good to excellent when the halides are activated by electronic effects

Title compounds, whose polarization is decreased by antiaromaticity of cyclopentadienone, have been synthesized through a novel Rh(II)-catalyzed arylation of cyclic 2-diazo-1,3-diones.

Summary The title compound which incorporates a strained bridgehead double bond and highly deformed cis and trans stilbene structures in bicyclo[4.2.2]-decane ring system was synthesized in good yield as an air-sensitive substance. Some reactions pertinent to strain were examined.

Title compounds, whose polarization is decreased by antiaromaticity of cyclopentadienone, have been synthesized through a novel Rh(II)-catalyzed arylation of cyclic 2-diazo-1,3-diones.

Summary The title compound which incorporates a strained bridgehead double bond and highly deformed cis and trans stilbene structures in bicyclo[4.2.2]-decane ring system was synthesized in good yield as an air-sensitive substance. Some reactions pertinent to strain were examined.