Novel spiro-heterocyclic compounds, their preparation, and use t

Details Novel spiro-heterocyclic compounds, their preparation, and use t Novel spiro-heterocyclic compounds, their preparation, and use t

1975-05-19

1977-10-04

Demers, Arthur P.

Gas separation: apparatus

Solid sorbent apparatus

With control means responsive to sensed condition

96 90PC, 250316, 260304R, 346135, 542401, G03C 102

Patent

active

040522180

ABSTRACT:
The invention relates to novel thermochromic spiro heterocyclic compounds having one or the other of the following formulae: ##STR1## where R.sub.1 denotes hydrogen atoms or one or more electron-donor groups in positions 5, 6, 7 and 8 in formula (1); R.sub.i ' denotes hydrogen atoms or one or more electron-donor or electron-acceptor groups in positions 4', 5', 6' and 7' and 4", 5", 6" and 7" in formulae (1) and (2); and R.sub.j denotes hydrogen atoms or one or more electron-donor groups in positions 5, 6, 7, 8, 9 and 10 in formula (2). Use in thermographic recording material.

REFERENCES:
patent: 3299079 (1967-01-01), Taylor
patent: 3320061 (1967-05-01), Taylor
patent: 3871886 (1975-03-01), Robillard
patent: 3896126 (1975-07-01), Oberlinner et al.
patent: 3923524 (1975-12-01), Haase
Gautron Chem. Abstracts 66 (1967) No. 105903.
Tolmachev et al., Ukr. Khim, Zh, 1971 37 (9) pp. 927-934.

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