| 单词 | closed chain |
| 释义 | > as lemmasclosed chain g. Chemistry. A number of similar atoms (usually of carbon) joined in series in a molecule. closed chain, a ring of similar linked atoms; open chain, one the ends of which are not joined together. ΘΚΠ the world > matter > chemistry > chemical structure or stereochemistry > [noun] > chain of atoms chain1881 main chain1969 the world > matter > chemistry > organic chemistry > [noun] > organic structure > carbon chain chain1881 branched chain1889 short chain1940 the world > matter > chemistry > chemical structure or stereochemistry > [noun] > ring of atoms nucleus1845 ring1869 closed chain1904 the world > matter > chemistry > chemical structure or stereochemistry > [noun] > chain of atoms > types side chain1873 branched chain1889 straight chain1890 open chain1928 short chain1940 1881 H. E. Roscoe & C. Schorlemmer Treat. Chem. III. i. 113 The atoms may thus be represented as forming a chain, one atom being linked on to the other, so that when one of them is removed without altering the position of the others, the chain is broken. 1904 G. F. Goodchild & C. F. Tweney Technol. & Sci. Dict. 111/1 When a number of atoms are joined together in a ring as distinct from a chain, the system is called a closed chain, and its derivatives closed chain compounds. 1913 J. B. Cohen Org. Chem. Adv. Students II. 137 The addition of hydrogen cyanide to aldehydes and ketones giving cyanhydrins afford an extremely useful method for the preparation of hydroxy acids containing an additional carbon atom in the chain. 1928 C. T. Kingzett Chem. Encycl. (ed. 4) 131 Open chains are regarded as having terminal atoms not mutually in combination, by which, for example, aliphatic combinations, such as the olefines and paraffins, are characterized. 1928 C. T. Kingzett Chem. Encycl. (ed. 4) 132 In closed chains, the terminal atoms are regarded as mutually combined, forming a ring, as in benzene. 1946 Nature 14 Dec. 864/1 The total chain-length of the alkyl substituents ranges from 13 to 15 carbon atoms. 1964 N. G. Clark Mod. Org. Chem. ii. 11 The skeleton of carbon atoms forming a paraffin molecule is usually referred to as a ‘chain’. < as lemmas |
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