(2) When the vowel at the end of the first word is accented, synalœpha is natural; Quintana:
Se heló la risa y se tornó en gemido.
(3) When the accent is on the last word, synalœpha is the general rule, especially when e is the first vowel; grande hombre, esta alma. Upon occasion hiatus sounds better, and especially so under a strong accent.
(a) Hiatus is preferable when there is a close syntactical connection between the vowel before the accent and the accented vowel, as, e.g., between the definite xxx article or the possessive adjective and its substantive, between the preposition and its object, etc.; Calderón:
Es sù àmo un caballero
De mucho valor y brío.
Lupercio de Argensola:
A èstos muerdas y á los otros ladres.
(b) The hiatus is most likely when the accented word is at the end of the phrase or verse, or occupies a strongly accented position in the verse; Meléndez Valdés:
¡Oh gran naturaleza!