RS-3-chloro-2-oxy-propyltrimethylammonium-chloride 1, an important inter- mediate of carnitine and acetylcholine, has been synthesized and resolved by using R,R-tartric acid. Di-(S-3-chloro-2-oxy-propyltrimethylammoni...RS-3-chloro-2-oxy-propyltrimethylammonium-chloride 1, an important inter- mediate of carnitine and acetylcholine, has been synthesized and resolved by using R,R-tartric acid. Di-(S-3-chloro-2-oxy-propyltrimethylammonium)-R,R-tartrate 2, with optical purity of 81.76%, has been obtained. Compound 2 was characterized by IR spectroscopy, MS, NMR and X-ray diffrac- tion, and it crystallizes in orthorhombic, space group P212121, absolute structure parameter 0.56(8), with cell parameters a = 8.323(2), b = 10.203(2), c = 26.178(5) ? C16H34Cl2N2O8, Mr = 453.272, V = 2223.0(8) ?, Z = 4, Dc = 1.354 g/cm3, m = 0.335 mm-1, F(000) = 968, R = 0.0534 and wR = 0.1274 for 4376 observed reflections (I > 2s(I)). The lattice is composed of two S-3-chloro- 2-oxy-propyltrimethylammonium cations and one R,R-tartrate dianion which are arranged in separate stacks linked via hydrogen bonds.展开更多
A kind of generalization of the Curve Type Node Configuration is given in this paper, and it is called the generalized node configuration CTNCB in Rs(s > 2). The related multivariate polynomial interpolation proble...A kind of generalization of the Curve Type Node Configuration is given in this paper, and it is called the generalized node configuration CTNCB in Rs(s > 2). The related multivariate polynomial interpolation problem is discussed. It is proved that the CTNCB is an appropriate node configuration for the polynomial space Pns(s > 2). And the expressions of the multivariate Vandermonde determinants that are related to the Odd Curve Type Node Configuration in R2 are also obtained.展开更多
文摘RS-3-chloro-2-oxy-propyltrimethylammonium-chloride 1, an important inter- mediate of carnitine and acetylcholine, has been synthesized and resolved by using R,R-tartric acid. Di-(S-3-chloro-2-oxy-propyltrimethylammonium)-R,R-tartrate 2, with optical purity of 81.76%, has been obtained. Compound 2 was characterized by IR spectroscopy, MS, NMR and X-ray diffrac- tion, and it crystallizes in orthorhombic, space group P212121, absolute structure parameter 0.56(8), with cell parameters a = 8.323(2), b = 10.203(2), c = 26.178(5) ? C16H34Cl2N2O8, Mr = 453.272, V = 2223.0(8) ?, Z = 4, Dc = 1.354 g/cm3, m = 0.335 mm-1, F(000) = 968, R = 0.0534 and wR = 0.1274 for 4376 observed reflections (I > 2s(I)). The lattice is composed of two S-3-chloro- 2-oxy-propyltrimethylammonium cations and one R,R-tartrate dianion which are arranged in separate stacks linked via hydrogen bonds.
基金the Science and Technology Project of Jiangxi Provincial Department of Education([2007]320)
文摘A kind of generalization of the Curve Type Node Configuration is given in this paper, and it is called the generalized node configuration CTNCB in Rs(s > 2). The related multivariate polynomial interpolation problem is discussed. It is proved that the CTNCB is an appropriate node configuration for the polynomial space Pns(s > 2). And the expressions of the multivariate Vandermonde determinants that are related to the Odd Curve Type Node Configuration in R2 are also obtained.
