Crystal modification of magnesium salt of mono-p-nitrobenzyl mal

Details Crystal modification of magnesium salt of mono-p-nitrobenzyl mal Crystal modification of magnesium salt of mono-p-nitrobenzyl mal

1990-04-20

1992-02-11

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562590, C07C 6938, C07C 67297

Patent

active

050877348

ABSTRACT:
The present invention provides a crystal modification of magnesium salt of mono-p-nitrobenzyl malonate (hereinunder referred to as ".beta.-type crystal") which is characterized by an X-ray diffraction pattern having strong peaks at angles of diffraction of (2.theta.) [.degree.] 4.5, 8.9 and 13.3 according to X-ray diffractometry with Cu-K.alpha. line, and a process for producing the .beta.-type crystal modification of magnesium salt of mono-p-nitrobenzyl malonate comprising the step of reacting a water-soluble magnesium salt with an alkali metal salt or ammonium salt of mono-p-nitrobenzyl malonate. This process facilitates the production of the .beta.-type crystal modification having a higher purity than a known .alpha.-type crystal modification. The .beta.-type crystal is a very useful intermediate as a starting material of pharmaceutical.

REFERENCES:
patent: 4786427 (1988-11-01), Dare-Edwards

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