device for calculating simulated in the exercise of eigengeschwindigkeit's dependence of simulated flugzeugsteuerungen in a fluguebungsgeraet

摘要

2,3 - Dihydropyran - 2 - yl - 2 - formyl - 2,3 - dihydropyran-2-yl-carbinol is made by adlol condensation of 2,3 - dihydro - 2 - formyl - 1,4 - pyran (acrolein dimer) at elevated temperature under substantially anhydrous conditions in the presence of a cupric salt of an organic acid, such as cupric benzoate, naphthenate or stearate. The catalysts are effective in concentrations from 0.01 to 1.0 weight per cent. The preferred temperature range is from 50 DEG to 150 DEG C. and the reaction time in the order of 24 hours. The product may be diluted with benzene and hydrogenated to give 2-methyloltetrahydropyran - 2 - yl - tetrahydropyran - 2 - yl - carbinol. If the carbinol is hydrated prior to hydrogenation the product is 5-methylol-1,5,6,7,11-undecane-pentol. In examples, acrolein dimer is heated for 24 hours at 120 DEG C. in the presence of (1) copper naphthenate in xylene solution; (2) copper benzoate; and (3) copper stearate; the product in each case is diluted with benzene and hydrogenated using Raney nickel as catalyst to yield the diol, and tetrahydropyran-2-methanol is obtained as a by-product from the hydrogenation of unreacted dimer. A comparative example describes the condensation of acrolein dimer in the presence of sodium hydroxide followed by hydrogenation. Specification 667,131 is referred to.