66723-45-3Relevant articles and documents
Syntheses and 1H-, 13C- and 15N-NMR spectra of ethynyl isocyanide, H-C≡C-N≡C, D-C≡C-N≡C and prop-1-ynyl isocyanide, H3C-C≡C-N≡C, D3C-C≡C-N≡C: High resolution infrared spectrum of prop-1-ynyl isocyanide
Buerger, Hans,Lentz, Dieter,Meisner, Britta,Nickelt, Natascha,Preugschat, Dagmar,Senzlober, Michael
, p. 3377 - 3385 (2000)
Ethynyl isocyanide, H-C≡C-N≡C (1a), deuteroethynyl isocyanide, D-C≡C-N≡C (1b), prop-1-ynyl isocyanide, H3C-C≡C-N≡C (1c), and trideuteroprop-1-ynyl isocyanide, D3C-C≡C-N≡C (1d) are synthesized by flash vacuum pyrolysis of suitable organometallic precursor molecules (CO)5Cr(CN-CCl=CClH) (5a), (CO)5Cr(CN-CCl=CClD) (5b), (CO)5Cr(CN-CCl?CCl-CH3) (5c) and (CO)5Cr(CN-CCl=CCl-CD3) (5d), respectively. Compounds 5a-d are formed in two steps by radical alkylation of tetraethylammonium pentacarbonyl(cyano)chro mate, NEt4[Cr(CO)5(CN)] (2) by 1,1,2,2,-tetrachloroethane (3a), 1,1,2,2-tetrachloro-1,2-dideuteroethane (3b), 1,1,2,2,-tetrachloropropane (3c), and 1,1,2,2-tetrachloro-1,3,3,3-tetradeuteropropane (3d) yielding [(CO)5Cr(CN-CCl2-CCl2-H)] (4a), [(CO)5Cr(CN-CCl2-CCl2D)] (4b), [(CO)5Cr(CN-CCl2-CCl2-CH3)] (4c), and [(CO)5Cr(CN-CCl2-CCl2-CD3)] (4d). Dehalo genation of 4a-d using zinc in diethylether/acetic acid gives 5a-d, respectively. A multinuclear NMR study revealed the 1H-, 13C- and 15N-NMR data of 1a and 1c. Molecular spectroscopic data of 1c were determined by high resolution infrared spectroscopy. The by-products of the pyrolysis are the E and Z isomers of the halogenated ethenyl isocyanides H(Cl)C=CCl-NC (6a) and H3C(Cl)C=CCl-NC (6c) which have been characterized by IR, MS and NMR spectroscopy.
Syntheses of halogenated ethenyl isocyanide chromium complexes as organometallic precursor molecules for ethenyl and ethynyl isocyanides
Balbo-Block, Marco,Bartel, Christoph,Lentz, Dieter,Preugschat, Dagmar
, p. 881 - 893 (2001)
The radical alkylation of tetraethylammonium pentacarbonyl(cyano) chromate 1 yielded the halogenated ethyl isocyanide complexes [(CO)5Cr-(CN-CCIX-CCIYF)] 3 (a. X=Cl, Y= F; b. X=F. Y=F and c. X=Y=Cl). Dehalogenation of 3 using zinc in diethyl ether gave [(CO)5Cr(CN-CX=CFY)] 4. The compounds 4a, b reacted with various nucleophiles exclusively at the difluoromethylene group. The unstable phosphorane 5, which is formed on reaction of 4b with trimethylphosphane, decomposed thermally and on hydrolysis yielding pentacarbonyl(1,2-difluoroethenyl isocyanide)chromium (6). The cyano substituent can be introduced in the β position of the isocyanide function by reaction of 4a. b with potassium cyanide, leading to the formation of [(CO)5Cr(CN-CX=CF-CN)] (7). Reactions of 4a, b with organolithium or organomagnesium compounds yielded [(CO)5Cr(CN-CX=CF-R)] (8) and [(CO)5Cr(CN-CF=CF-C≡C-CF=CF-NC)Cr(CO)5] (10). The trimethylsilyl group in 8a, b, d could be removed by a solution of potassium carbonate in methanol leading to [(CO)5Cr(CN-CX=CF-Cn-H)] (11) (n=2, 4). Octacarbonyldicobalt reacted with 8e under coordination of the C-C triple bond to the hexacarbonyldicobalt fragment, resulting in the cluster compound 12. The crystal and molecular structure of 8i, 11a, b, and 12 were elucidated by X-ray crystallography. The alkenyl and alkynyl isocyanides CN-CCl=CF2 (13a). CN-CF=CF2 (13b). CN-CCl=CCIF (13c), CN-CF=CFH (14), CN-CC-H (15), CN-CC-CN (16), and CN-CCl=CF-CN (17) were obtained by flash vacuum pyrolysis of 4a, 4b, 4c, 6, and 7a, respectively.
Synthese und Struktur von Ethinylisocyanid
Krueger, Michael,Dreizler, Helmut,Preugschat, Dagmar,Lentz, Dieter
, p. 1674 - 1676 (2007/10/02)
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