i once read that nitroethene adds to indole to form ethylnitro indole. refs from dictionary of organic compounds say nitroethene is formed by heating 2-nitro ethanol with some semi-exotic but getable compound to eliminate water. refs say 2-nitro ethanol is in turn formed by reacting nitromethane with formaldehylde. is this method known? if so, can someone provide details on conditions and yield.