41. In contrast, in the case of the Pratt diene rearranging, there are two possible regiochemistries-a and b. 42. Cyclohexadienes, many derived from Birch reduction of aromatic compounds, form derivatives ( diene ) Fe ( CO ) 3. 43. The relationship is only valid for the groups on the diene alone, or the groups on the dienophile, alone. 44. The threat to the rule of law stems both from the legislation adopted and the way it is enforced, Diene said. 45. The threat to the rule of law stems from both the legislation adopted and the way it is enforced, Diene said. 46. Kurt Alder was awarded the Nobel Prize in Chemistry in 1950 for his " discovery and development of the diene synthesis ". 47. The [ 2.2 ] paracyclophane-1, 9-diene has been applied in Grubbs'second generation catalyst: 48. Generally abbreviated COD, this diene is a useful precursor to other organic compounds and serves as a ligand in organometallic chemistry. 49. All the metabolites of dydrogesterone retain the 4, 6-diene -3-one structure, and are metabolically stable. 50. These types of systems have also allowed superior methods for production of ethylene / propylene and ethylene / propylene / diene elastomers.
