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cheletropic reactions nitrone-olefin cycloaddition huisgen cycloadditions woodward – hoffmann rule suprafacial-antarafacial interaction suprafacial-suprafacial interaction classification examples mode of addition stereochemistry cycloadditions pericyclic reactions maceration with adjustment extraction with agitation continuous hot percolation process reserve percolation process simple percolation process extraction with reflux decoction infusion various methods ideal properties of solvents extraction transition metal catalysis ptc phase transfer catalysis organi catalysis enzyme catalysis biocatalysis metal catalysis free radicals free radical protection for amino group protection for carboxyl group protection for carbonyl group protection for hydroxyl group alkaloids natural products radicals organic intermediates reaction intermediates