4-Pyridylnitrene and 2-pyrazinylcarbene
نویسندگان
چکیده
Both flash vacuum thermolysis (FVT) and matrix photolysis generate 2-diazomethylpyrazine (22) from 1,2,3-triazolo[1,5-a]pyrazine (24). FVT of 4-azidopyridine (18) as well as of 24 or 2-(5-tetrazolyl)pyrazine (23) affords the products expected from the nitrene, i.e., 4,4'-azopyridine and 2- and 3-cyanopyrroles. Matrix photolyses of both 18 and 24 result in ring expansion of 4-pyridylnitrene/2-pyrazinylcarbene to 1,5-diazacyclohepta-1,2,4,6-tetraene (20). Further photolysis causes ring opening to the ketenimine 27.
منابع مشابه
3-Pyridylnitrene, 2- and 4-pyrimidinylcarbenes, 3-quinolylnitrenes, and 4-quinazolinylcarbenes. Interconversion, ring expansion to diazacycloheptatetraenes, ring opening to nitrile ylides, and ring contraction to cyanopyrroles and cyanoindoles
Precursors of 3-pyridylnitrene and 2- and 4-pyrimidinylcarbenes all afford mixtures of 2- and 3-cyanopyrroles on flash vacuum thermolysis, but 3-cyanopyrroles are the first-formed products. 3-Quinolylnitrenes and 4-quinazolinylcarbenes similarly afford 3-cyanoindoles. 2-Pyrimidinylcarbenes rearrange to 3-pyridylnitrenes, but 4-pyrimidinylcarbenes and 4-quinazolinylcarbenes do not necessarily re...
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Subset 0x 1x 2x 3x 4x 5x 6x 7x 8x 9x Ax Bx Cx Dx Ex Fx 0x 32 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1x 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2x 0 4 −2 2 −2 2 −4 0 4 0 2 −2 2 −2 0 −4 3x 0 0 −2 6 −2 −2 4 −4 0 0 −2 6 −2 −2 4 −4 4x 0 2 −2 0 0 2 −2 0 0 2 2 4 −4 −2 −2 0 5x 0 2 2 −4 0 10 −6 −4 0 2 −10 0 4 −2 2 4 6x 0 −2 −4 −6 −2 −4 2 0 0 −2 0 −2 −6 −8 2 0 7x 0 2 0 2 −2 8 6 0 −4 6 0 −6 −2 0 −6 −4 8x 0 0 2 6 0 0 −2 −6...
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متن کاملWork supported in part by US Department of Energy contract DE-AC02-76SF00515
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