𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Carbon-13 NMR chemical shifts of 1-alkyl-3(5)-cyano-1H-pyrazole-4-carboxylic acid esters

✍ Scribed by George E. Babbitt; Michael P. Lynch; James R. Beck

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
199 KB
Volume
28
Category
Article
ISSN
0749-1581

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

A compilation of ^13^C NMR chemical shifts for 13 pairs of 3‐ and 5‐cyano‐substituted pyrazole regioisomers is reported. All of the ring carbon and cyano carbon ^13^C chemical shifts show a regular, predictable correlation with the particular isomer, whether 3‐cyano or 5‐cyano. These shifts occurred in very narrow ranges, precluding any confusion of assignment within the group of compounds studied. x‐ray crystallographic analysis was performed on one of the samples.

📜 SIMILAR VOLUMES

Synthesis of pinacol esters of 1-alkyl-1
Synthesis of pinacol esters of 1-alkyl-1H-pyrazol-5-yl- and 1-alkyl-1H-pyrazol-4-ylboronic acids
✍ Alexandre V. Ivachtchenko; Dmitry V. Kravchenko; Valentina I. Zheludeva; Dmitry 📂 Article 📅 2004 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 128 KB

## Abstract Starting from 1__H__‐pyrazol, a wide number of 1‐alkyl‐1__H__‐pyrazol‐4‐yl and 1‐alkyl‐1__H__‐pyrazol‐5‐ylboronic acids and their pinacol esters were synthesized and characterized. The key step in the described methodology is the regioselective lithiation of the pyrazole ring. The synth

Carbon-13 NMR shift data of some 3H-1,4-
Carbon-13 NMR shift data of some 3H-1,4-benzodiazepine-2,5(1H, 4H)-diones
✍ Ghulam Mohiuddin; Padala Satyanarayana Reddy; Chengalvala Venkata Ratnam 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 145 KB

Carbon-13 chemical shifts of eight 3H-1,4-benzodiazepine-2,5( lH, 4H)-diones are reported. The carbonyl chemical shifts have diagnostic value for distinguishing these diones from the isomeric 1,3-benzodiazepine-2,5-dione structures.

Functionalization and cyclization reacti
Functionalization and cyclization reactions of 4-benzoyl-1,5-diphenyl- 1H-pyrazole-3-carboxylic acid
✍ Yunus Akcamur; Ahmet Sener; Alemdar Mustafa Ipekoglu; Gert Kollenz 📂 Article 📅 1997 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 294 KB 👁 1 views

## Abstract The 1__H__‐pyrazole‐3‐carboxylic acid 2 or its remarkably stable acid chloride 3 can easily be converted into the corresponding ester or amide derivatives 4 or 5, respectively, from reaction with alcohols or __N__‐nucleophiles. Pyrazolo[3,4‐__d__]pyridazines 6a,b are obtained from cyclo

Synthesis and some reactions of 4-(ethox
Synthesis and some reactions of 4-(ethoxycarbonyl)-1,5-diphenyl-1H-pyrazole-3-carboxylic acid
✍ Ahmet Şener; İshak Bildirici; İsrafil Tozlu; Hasan Genç; Kadir Arısoy 📂 Article 📅 2007 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 382 KB 👁 1 views

## Abstract magnified image 1,5‐Diphenyl‐1__H__‐pyrazole‐3,4‐dicarboxylic acid‐4‐ethyl ester **2**, obtained from the 4‐ethoxycarbonyl‐5‐phenyl‐2,3‐furandione **1** and __N__‐benzylidene‐__N__′‐phenyl hydrazine, was converted __via__ reactions of its acid chloride **3** with various alcohols or N‐