Compound, liquid-crystal composition, and radio frequency phase shifter

A compound represented by general formula (1):

• where R1 denotes a hydrogen atom or a C1 to C20 linear or C3 to C20 branched or cyclic alkyl group, the alkyl group optionally having any hydrogen atom therein replaced with a halogen atom and optionally having one —CH2—therein, or each of two or more independently, replaced with —O—, —S—, —CO—, —CS—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—, —CF═CF—, or —C≡C—, with the proviso that no oxygen atoms are bound directly to one another;
• R2 denotes a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfanyl group, a nitro group, a cyano group, an isocyano group, an amino group, a hydroxyl group, a mercapto group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, a trimethylsilyl group, a dimethylsilyl group, or a C1 to C20 linear or C3 to C20 branched or cyclic alkyl group optionally having one —CH2—therein, or each of two or more independently, replaced with —O—, —S—, —CO—, —CS—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF═CF—, or —C≡C—, with the proviso that no oxygen atoms are bound directly to one another, the alkyl group optionally having any hydrogen atom therein replaced with a fluorine atom;
• A1 and A2 each independently denote a substituted or unsubstituted C3 to C16 hydrocarbon ring or heterocycle, and a plurality of A2s may be the same or different;
• L1 and L2 each independently denote a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, a pentafluorosulfanyl group, a nitro group, a cyano group, an isocyano group, an amino group, a hydroxyl group, a mercapto group, a methylamino group, a dimethylamino group, a diethylamino group, a diisopropylamino group, a trimethylsilyl group, a dimethylsilyl group, a thioisocyano group, or a C1 to C20 linear or C3 to C20 branched or cyclic alkyl group optionally having one —CH2— therein, or each of two or more independently, replaced with —O—, —S—, —CO—, —CS—, —COO—, —OCO—, —CO—S—, —S—CO—, —O—CO—O—, —CO—NH—, —NH—CO—, —CH═CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —CH═CH—, —CF≡CF—, or with the proviso that no oxygen atoms are bound directly to one another, the alkyl group optionally having any hydrogen atom therein replaced with a fluorine atom;
• Z1 on each occurrence independently denotes a single bond, —CH═CH or —C≡, a plurality of Z1s may be the same or different, and at least one of the Z1s, or the Z1 if there is only one Z1, denotes C≡C—;
• and
• n1 denotes an integer of 1 to 3.