Oxaphospholane compound

Phosphorous Compound The phosphorous compoimd that can be used as fire retardant include a phosphoric acid ester compoimd, a phosphoamidate compound, an oxaphospholane compound, a carboxy phosphinic acid, phosphoric acid ester morpholide compound and a phosphazene compound. The phosphorous compounds are used alone or in combination. The phosphorous compound may be used in the amount of about 0.1 to 50 parts by weight based on 100 parts by weight of the base resin. The phosphorous compounds are described in detail as follows. 

Oxaphospholane Compound The oxaphospholane compound is represented by the following chemical formula (II) ... 

The examples of the oxaphospholane compound are 2-methyl-2,5-dioxo-l-oxa-2-phospholane and 2-phenyl-2,5-dioxo-l-oxa-2-phospholane. The oxaphospholane compounds are used alone or in combination. 

Cyclization of terminal unsaturated phosphonates under the action of iodine, proceeding via the formation of intermediate co-haloalkyl-substituted compounds, presents a convenient alternative to the above procedures [63-65], The reaction has a general character and besides 1,2-oxaphospholanes allows synthesis of the corresponding 1,3,2-dioxa- and 1,3,2-oxaza- derivatives (Scheme 34). The length of the linker... 

Besides co-halo- and co-hydroxyalkyl-substituted phosphorus compounds, both C- and P-acid chlorides of mixed phosphonoalkyl-substituted carboxylic acids are inclined to intramolecular cyclization, yielding intracyclic anhydrides of these acids, namely 2,5-dioxo-l,2-oxaphospholanes 78 (Scheme 46) [100-103], Reasonably, C-acid halides undergo cyclization more rapidly than their P-analogues. Moreover, as... 

The following groups of P-containing compounds were cationically polymerized 2-substituted-2-oxo-l,3,2-dioxophospholanes (ODPL) and the corresponding phos-phorinanes (ODPR), 2-substituted-l,3,2-dioxaphospholanes (DPL) and phosphori-nanes (DPR), 2-substituted-l,3,2-oxazaphospholidines (OAP) and 2-substituted-1,2-oxaphospholanes (OPL) ... 

Oxaphospholans (29) are obtained from secondary phosphines and aldehydes or ketones. Similarly, condensation of (o-aminophenyl)-phosphine with carbonyl compounds gave substituted 1,3-benzazaphos-... 

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