Cycloids containing oxygen. 816 



CYCLOID CcHl04 



/9, 7-Dioxypropyl malonic acid 

 dilactone 



(5, y-(lilactone) 



/CO CH.CO 



0< Cll2< • 



\CH2 CH.O 



Also the diaraide and tlie a-bromo- 

 derivative. 



Lenchs ii. Splettstosser, 0. B., 40, 



(301). 



CYCLOID CsHioO* 



Glycerine-a-oxypropionic acid 

 lactone 



CH2(OH).CH<g^^2-^Q>CHMe (?) 



BischoflF, C. A. B., 40, (2803). 

 CYCLOID C7Hfc04 



Dimethylpentadilactone 

 CO— CMe—O 

 I CH^ I 

 — CMe— CO 

 Fittig 11. Kraus, P. A., 353, (13). 



CYCLOIDS C7Hi,04 



Glycerine- oi-oxybutyric acid lactone 



CHj(OH).CH<g^=-J;5o>*^^^* ^-^ 

 Also Glycerine-a oxyisobutyric acid 

 lactone. 



Bischoff, C. A. B., 40, (2803). 

 CYCLOID CSH4O4 



Protocatechuic aldehyde carbonate 



CO<J]>C6H3.CHO 

 Panly, H. B., 40, (3096). 



CYCLOIDS C3H,o04 



Methylethylp entadilactone 

 CO— CEt— 

 I CH, I 

 — CMe— CO 

 Fittig u. Panayefl, J. von. A., 353, (24). 



Dimethylhexadilactone. 

 Fittig u. Lentz, F. A., 353, (52). 



1912 



CYCLOID C,H O4 



Homopiperonylic acid 



CHj : O2 : C6H3.CH2.CO2H 

 Synthesis. Nitiule. 

 Medinger, P. .M. , 27, (237). 



CYCLOID CaHiv04 



Ethyldimethylpentadilactone. 



Fittig u. Peters, W. A., 353, (.iS). 



CYCLOID CioHb04 



Pyrone lactone 



CMe.O.C— 0— CO 



CH.CO.'C.CMe : CH 



Fleischmann. [Pyrone-lactone formed 

 by the condensation of triacetic lactone 

 with acetoacetie ester or /3-aminocro- 

 tonic ester ; and its broniinatioii and 

 nitration.] J.C, 91, (250). 



CYCLOID C22H14O4 



m, m'-Ditolyldioxyphtlialide. 

 Baeyer, A. A., 354, (152;. 



CYCLOID C26H16O4 



Coerbioxendiol 



(Carbinol base of cuerbioxoniiim). 



Decker n. Fellenberg, T. von. A., 

 356, (281). 



CYCLOIDS WITH FIVE OXYGEN 

 ATOMS. 



CYCLOID C2oH,205 



Fluorescein. 



OXYFLUOKESCEIX 



OH.C6H3^(.^C6H3(OH) Q 



CO.O C6H3(OH) 



and its triacetyl derivative and tetra- 



bromo-Jerivative (oxyeosin). 



The METHYL ETHER 



OMe.CeHj ^, ^CeH3(0H) q 



CO.O C6H3(OH) 



and its diaeetate and tetrabromo- 



derivative (methoxyeosin). 



DlMETHOXYFLUORESCEIN 



(OMe)2CeH2 > c<^^^'^^^^^>0 

 CO.O C6tl3(OH) 



and its tetrabromo-derivative 

 (dimethoxyeosin). 



Friedl, Weizmann & Wyler. Fluor- 

 esceins and eosins from 4-hydroxy- 

 phthalic, 4-methoxvphthalic, and hemi- 

 pinic acids. J.C, 91, (1584). 



