. . "regioselectivity of 1,3 dipolar cycloadditions" . "1,3 dipolar cycloaddition" . "1,3-Dipolar cycloaddition" . "1,3-Dipolar cycloaddition" . "1,3-dipolar cycloadditions" . "1,3-dipolar cycloaddition" . . "dipolarophile" . "dipolar" . . . . . . .