We　report　an　iron-catalyzed　general　functional　group　protection　method　with　inexpensive　reagents.　This　environmentally　benign　process　does　not　use　acids　or　bases,　and　does　not　produce　waste　products.　Further　purification　beyond　filtration　and　evaporation　is,　in　most　cases,　unnecessary.　Free　COOH　and　OH　groups　can　be　protected　in　a　one-pot　reaction.