Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2023 Jan 23;24(3):2263. doi: 10.3390/ijms24032263

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Scheme 1 — Derivatives of R-(−)- and S-(+)-carvone and their respective synthetic processes and yields (in %). Reagents: (a) H₂SO₄ 50% aq, 0 °C, 22%; (b) (CH₃CO)₂O, DMAP/THF, r.t., 71%; (c) m-CPBA, CH₂Cl₂, 0 °C, 66%; (d) NH₂NH₂·H₂SO4, CH₃OH, 50 °C, 44%; (e) NH₂NH₂·H₂SO₄, CH₂CH₃OH, 50 °C, 19%; (f) m-CPBA, CH₂Cl₂, 0 °C, 59%; (g) H₂SO₄ 50% aq, 0 °C, 21%, (h) NH₂NH₂·H₂SO₄, CH₃OH, 50 °C, 49%; (i) NH₂NH₂·H₂SO₄, CH₂CH₃OH, 50 °C, 25%; (j) (CH₃CO)₂O, DMAP/THF, r.t., 34%.