Dibenzopyrone derivatives which possess depressant and/or antihypoxia activity are 1,3-bis(dibenzo[b,d]pyranyloxy propanes having the formula (1): ##STR1## where R and R.sup.1 independently represent hydrogen or methyl; where A is ##STR2## and where X represents single substitution with oxygen or substitution with hydrogen and a second group taken to be hydrogen, hydroxyl, amino, C.sub.1 -C.sub.4 alkylamino or an acyloxy radical ##STR3## where B represents C.sub.1 -C.sub.15 alkyl, --CH.sub.2 CH.sub.2 COOH, or (dimethylamino)phenyl. Also included are pharmaceutically acceptable salt forms of the compounds. These compounds are useful as sedatives and/or for the protection of warm blooded animals from the effects of oxygen deprivation.
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 1](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-1.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 1")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 2](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-2.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 2")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 3](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-3.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 3")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 4](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-4.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 4")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 5](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-5.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 5")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 6](http://www.wikipatents.com/bis-dibenzobdpyranyloxy-propanes/T/US4647674-6.jpg "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 - Page 6")
![Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 Drawing](http://www.wikipatents.com/us/4647674.png "Bis-(dibenzo[b,d]pyranyloxy) propanes - US Patent 4647674 Drawing")
