(R)-2-(methoxymethoxy)-5-hexynyl pivaloate

(R)-2-(tert-butyldimethylsilyloxy)-5-hexynyl pivaloate

(R)-2-(tert-butyldimethylsilyloxy)-5-hexynyl p-toluenesulfonate

(4R)-4-(but-3-yn-1-yl)-2,2-dimethyl-1,3-dioxolane

(2R)-1-[(4-methoxybenzyl)oxy]hex-5-yn-2-ol