dihydro-


Also found in: Medical.

dihydro-

[dī¦hī·drō]
(chemistry)
A prefix indicating combination with two atoms of hydrogen.
References in periodicals archive ?
Most dermatologists accept that a major cause of inherited male-pattern baldness is over-sensitivity of the hair follicles to the hormone dihydro- testosterone.
Preparing 3- methyl-1- phenyl- 4-(3'- methyl- 1- phenyl- 4 , 5 - dihydro- 5 - oxopyrazol- 4 - yl- pyrazolo [5, 4-d] -4H-1- benzopyran (1a) In a round-bottom emery-top balloon, the mixture of 2 grams (0.011 mol) 3-methyl-1-phenyl-2- pyrazolin-5-on, 0.70 grams (0.006 mol) 2-hydroxy benzaldehyde and 50 mL ethanol, in presence of 0.5 mL hydrochloric acid, was refluxed on a steam bath for 36 hr.
Preparing 3- methyl- 1- phenyl- 4-(3'- propyl- 1- phenyl- 4', 5'- dihydro- 5'- oxopyrazol- 4'- yl- pyrazolo [5, 4-d]- 4H-1- benzopyran (1c) A crystal-white solid; Mp: 156-158 C (hexaneEt2O); 1H NMR (400 MHz, CDCl3) d 1.15 (t, 3H, -CH3), 1.32 (t, 3H, -CH3), 1.82-1.99 (sextet, 2H, -CH2), 2.01-2.10 (sextet, 2H, -CH2), 2.93 (t, 2H, -CH2), 3.23 (t, 2H, -CH2), 5.55 (s, 2H, Pyrazol), 7.20-7.92 (m, J=7Hz, 15H, Aromatic- H); 13 C NMR (CDCl3) d 12.1, 13.7, 24.00, 24.2, 27.3, 29.4, 119.00, 120.00, 120.1, 120.2, 120.7, 121.2, 122.5, 122.7, 124.7, 126.3, 128.00, 129.4, 129.6, 129.8, 130.1, 139.7, 139.9, 147.6, 150.1, 155.00; EIMS m/z 490 (M+, 91.06); Anal.