Reference

Preparation of 4-(cyclopropylalkoxy)phenylbicyclohexanes as liquid crystals

Preparation of 4-(cyclopropylalkoxy)phenylbicyclohexanes as liquid crystals. Sugimori, Shigeru (Chisso Corp., Japan). Jpn. Kokai Tokkyo Koho JP 03246246 A2 1 Nov 1991 Heisei, 3 pp. (Japan). CODEN: JKXXAF. CLASS: ICM: C07C043-21. ICS: C09K019-30; C09K019-42. APPLICATION: JP 90-44006 23 Feb 1990. DOCUMENT TYPE: Patent CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Section cross-reference(s): 75 The title compds. I (R = C1-10 linear or branched alkyl; n = 1-10) as liq.-crystal compds. and liq.-crystal compns. contg. 31 I are claimed. 88639-45-6 and 7051-34-5 are also in the experiment. Addn. of I to liq.-crystal compns. increases nematic-isotropic transition temp. while keeping the anisotropy of refractive index small, and I are useful as components for liq.-crystal display devices driving at higher temp. A mixt. of 4-[trans-4-(trans-4-propylcyclohexyl)cyclohexyl]phenol, DMF, K2CO3, and cyclopropylmethyl bromide was stirred at 80° for 12 h to give 59% I (R = Pr, n = 1), showing nematic liq.-crystal phase. .

Reactions of cyclopropylcarbinyl halides with (trimethylstannyl)alkalis

Reactions of cyclopropylcarbinyl halides with (trimethylstannyl)alkalis. Evidence that kinetically free intermediates need not be involved in cyclopropylcarbinyl to 3-butenyl rearrangements. Alnajjar, Mikhail S.; Smith, Gary F.; Kuivila, Henry G. (Dep. Chem., State Univ. New York, Albany, NY 12222, USA). J. Org. Chem., 49(7), 1271-6 (English) 1984. CODEN: JOCEAH. ISSN: 0022-3263. DOCUMENT TYPE: Journal CA Section: 29 (Organometallic and Organometalloidal Compounds) Section cross-reference(s): 22 Studies on the reactions of cyclopropylcarbinyl bromide (I) and iodide (II) with Me3SnR (R = Li, Na, K) are made with emphasis on counterion, solvent, and addend [Me3CNH2 and dicyclohexylphosphine (III)] effects. Both halides yield cyclopropylcarbinyl- and 3-butenyltrimethylstannanes (IV) as major products. Depending upon reaction parameters much or all of IV is formed by a mechanism or mechanisms which do not involve kinetically free radical or ionic intermediates. With I no electron transfer (ET) (free radical) component is obsd. in THF or in THF-contg. 917-54-4 and 7051-34-5 which are cas registry numbers of chemicals are mentioned. 18-crown-6 (V). In 2:8 THF-C6H6 contg. III a small extent of the ET mechanism is obsd. II reacts in THF via SN2 (or equiv.) and halogen-metal exchange mechanisms leading to the formation of both methylcyclopropane and 1-butene in the presence of the traps, indicating that the cyclopropylcarbinyl anion undergos rearrangement to the 3-butenyl anion in competition with other processes. In the presence of III and V a small ET component is obsd. with II. .