LII.—Configuration of the stereoisomeric diphenylsuccinic acids

Abstract

WREN AND STILL: CONFIQURATION OF THE LIL-Configuration o j the Stereoisomeric Diphen ylsuccinic Acids.

Dependence of the Reactivities of Titanium Enolates on How They Are Generated: Diastereoselective Coupling of Phenylacetic Acid Esters Using Titanium Tetrachloride

“…dl - 6a : mp 163−164 °C (lit . mp 165−166 °C); IR (KBr) 3030, 2990, 2950, 1730, 1435, 1305, 1250, 1155, 740, 700 cm -1 ; 1 H NMR (CDCl 3 ) δ 3.70 (s, 3H), 4.25 (s, 1H), 6.95−7.08 (m, 2H), 7.08−7.16 (m, 3H); MS 298, 266, 238, 206, 179, 165, 149, 139, 121 (P), 102, 91, 77, 60, 52.…”

Coupling of carbanions. Formation of succinic acid derivatives

“…The A Value of Hydroxyl Determined by the Nuclear Magnetic Resonance Peak Area Method at -83°C . Hackett Bushweller, Jane A. Beach,1 James W. O'Neil, and Geetha U. Rao Department of Chemistry, Worcester Polytechnic Institute, Worcester, Massachusetts 01609 Received September 9,1969 A myriad of reports have appeared concerning the measurement of the A value of hydroxyl (eq 1 and 2) OH Ha A value = -AG°= (RT In A)/1000 (2) employing a large variety of techniques.2-4 The observed A values are solvent dependent but deviate seriously from one technique to another in the same solvent.2 This paper concerns the measurement of the A value of hydroxyl in cyclohexanol-2,2,6,6-d4 at -83°u tilizing variable-temperature nuclear magnetic resonance (nmr) spectroscopy, a technique of proven accuracy.3…”

Meso‐ and Dl‐ Diethyl 2,3‐Diphenylsuccinate from the Electrochemical Reduction of Ethyl α‐Bromophenylacetate

“…The simplest mechanism which can explain the data on Hg is probably the following (19) El RBr -{-Hg ~ e > RHg ~ Br- [2] slow ; 89…”

“…Mass spectrum of I (t ----120~ m/e: 326 (M+), 325 (M-H), 324 (M-2H), 281 (M-OEt), 280 (M-EtOH, metastable peak for the transition 326 --> 280 at m* 240.5), 253 (M-COOEr), 252 (M-EtOH-CO, metastable peak for 280 --> 252 at m* ----226.8), 248 (M-H-PH), 235 (M-H-2 OEt), 224, 223, 207, 206, 195, and appropriate peaks at lower role.The remaining ethereal solution was filtered, the solvent removed under vacuum, obtaining a yellowbrown substance which was crystallized from petroleum ether to white crystals (0.200g) melting at 74 ~ 77~ [lit (2,8). Mass spectrum of I (t ----120~ m/e: 326 (M+), 325 (M-H), 324 (M-2H), 281 (M-OEt), 280 (M-EtOH, metastable peak for the transition 326 --> 280 at m* 240.5), 253 (M-COOEr), 252 (M-EtOH-CO, metastable peak for 280 --> 252 at m* ----226.8), 248 (M-H-PH), 235 (M-H-2 OEt), 224, 223, 207, 206, 195, and appropriate peaks at lower role.The remaining ethereal solution was filtered, the solvent removed under vacuum, obtaining a yellowbrown substance which was crystallized from petroleum ether to white crystals (0.200g) melting at 74 ~ 77~ [lit (2,8).…”