Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory

Lavallo V, Canac Y, Donnadieu B, Schoeller W, Bertrand G (2006)
SCIENCE 312(5774): 722-724.

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Abstract
Like many of the molecular species that have been detected in the interstellar medium, the singlet carbene cyclopropenylidene (C3H2) has been presumed to be too unstable to isolate in the laboratory. However, by appending pi-electron-donating amino groups to the triangular skeleton, we prepared a cyclopropenylidene derivative that is stable at room temperature. In contrast to previously isolated carbenes, this compound does not require a heteroatom adjacent to the electron-deficient carbon to confer stability. Despite the presence of amino groups, the geometric parameters of the cyclic skeleton, revealed by x-ray crystallography, are only slightly perturbed relative to those of the calculated structure of unsubstituted cyclopropenylidene. Stable cyclopropenylidene derivatives might thus serve as models for a better understanding of the formation of carbon-bearing molecules in the interstellar medium.
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Lavallo V, Canac Y, Donnadieu B, Schoeller W, Bertrand G. Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory. SCIENCE. 2006;312(5774):722-724.
Lavallo, V., Canac, Y., Donnadieu, B., Schoeller, W., & Bertrand, G. (2006). Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory. SCIENCE, 312(5774), 722-724. doi:10.1126/science.1126675
Lavallo, V., Canac, Y., Donnadieu, B., Schoeller, W., and Bertrand, G. (2006). Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory. SCIENCE 312, 722-724.
Lavallo, V., et al., 2006. Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory. SCIENCE, 312(5774), p 722-724.
V. Lavallo, et al., “Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory”, SCIENCE, vol. 312, 2006, pp. 722-724.
Lavallo, V., Canac, Y., Donnadieu, B., Schoeller, W., Bertrand, G.: Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory. SCIENCE. 312, 722-724 (2006).
Lavallo, V, Canac, Y, Donnadieu, B, Schoeller, Wolfgang, and Bertrand, G. “Cyclopropenylidenes: From interstellar space to an isolated derivative in the laboratory”. SCIENCE 312.5774 (2006): 722-724.
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