UPDATE 1-What to Watch in the Week Ahead and on Monday, April 20

A slew of Dow 30 companies report results in the week: Chemicals conglomerate DuPont, industrial conglomerate United Technologies Corp, property and casualty insurer Travelers Companies Inc and wireless carrier Verizon Communications Inc on Tuesday; McDonald's Corp, AT&T Inc, Boeing Co and Coca-Cola Co on Wednesday; and diversified manufacturer 3M Co, Procter & Gamble and Microsoft Corp on Thursday. While DuPont is expected to report lower first-quarter results, Travelers Companies Inc's first-q