𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Cycloaddition reactions of arylmethylenemalonaldehydes: an approach to 4-aryl-3,4-dihydro-2h-pyran-5-carboxaldehydes

✍ Scribed by D. Dvořák; Z. Arnold

Publisher
Elsevier Science
Year
1982
Tongue
French
Weight
161 KB
Volume
23
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis

The reaction of arylmethylenema lonaldehyties I with various types of olefins afforded a series of 4-aryl-3,4-dihydro-2H-pyran-5-carboxaldehydes III. Esploring chemistry of arylnethylenemalonaldehydes I, readily accessible by the method recently developed in our Laboratory', we have ascertained a very pronounced reactivity of these compounds in cycloaddition reactions2. Playing

📜 SIMILAR VOLUMES

Cyclization vs. Elimination Reactions of
Cyclization vs. Elimination Reactions of 5-Aryl-5-hydroxy 1,3-Diones: One-Pot Synthesis of 2-Aryl-2,3-dihydro-4H-pyran-4-ones
✍ Rasheed Ahmad Khera; Rasheed Ahmad; Ihsan Ullah; Obaid-Ur-Rahman Abid; Olumide F 📂 Article 📅 2010 🏛 John Wiley and Sons 🌐 German ⚖ 222 KB 👁 1 views

## Abstract 2‐Aryl‐2,3‐dihydro‐4__H__‐pyran‐4‐ones were prepared in one step by cyclocondensation of 1,3‐diketone dianions with aldehydes. The use of HCl (10%) for the aqueous workup proved to be very important to avoid elimination reactions of the 5‐aryl‐5‐hydroxy 1,3‐diones formed as intermediate