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The mechanism of the disproportionation of 2,5-diethyl-3,4-dihydro-2H-pyran-2-carbaldehyde in the Cannizzaro reaction in ethanol was studied by quantum-chemical modeling. The geometry was optimized by the semiempirical RM1 method in the unrestricted Hartree–Fock approximation, and the heats of formation of the reagents and transitional states were calculated. Two possible hydride transfer reaction...