  Protoplanetary disks around Herbig AeBe stars are exciting targets for
studying the chemical environments where giant planets form. Save for a few
disks, however, much of Herbig AeBe disk chemistry is an open frontier. We
present a Submillimeter Array (SMA) $\sim$213-268 GHz pilot survey of mm
continuum, CO isotopologues, and other small molecules in disks around five
Herbig AeBe stars (HD 34282, HD 36112, HD 38120, HD 142666, and HD 144432). We
detect or tentatively detect $^{12}$CO 2--1 and $^{13}$CO 2--1 from four disks;
C$^{18}$O 2--1 and HCO$^+$ 3--2 from three disks; HCN 3--2, CS 5--4, and
DCO$^+$ 3--2 from two disks; and C$_2$H 3--2 and DCN 3--2 from one disk each.
H$_2$CO 3--2 is undetected at the sensitivity of our observations. The mm
continuum images of HD 34282 suggest a faint, unresolved source $\sim$5\farcs0
away, which could arise from a distant orbital companion or an extended spiral
arm. We fold our sample into a compilation of T Tauri and Herbig AeBe/F disks
from the literature. Altogether, most line fluxes generally increase with mm
continuum flux. Line flux ratios between CO 2--1 isotopologues are nearest to
unity for the Herbig AeBe/F disks. This may indicate emitting layers with
relatively similar, warmer temperatures and more abundant CO relative to disk
dust mass. Lower HCO$^+$ 3--2 flux ratios may reflect less ionization in Herbig
AeBe/F disks. Smaller detection rates and flux ratios for DCO$^+$ 3--2, DCN
3--2, and H$_2$CO 3--2 suggest smaller regimes of cold chemistry around the
luminous Herbig AeBe/F stars.
